Method of making storage-battery jars



H. L. BOYER. METHOD or MAKING VSTORAGE BATTERY JARS.

APPLICATION FILED AUG-6. i917. l

Patented Sept. 7 1920.

`the core.

UNITED STATES'l HARRY L. BOYER, OE TEENTON, 'NEW lTEEsEY, AssrGNOE-vro :ros. STOEES'RBEEE COMPANY, or r rEEN'rON, NEW JERSEY, A CORPORATION or NEW JERSEY.

METHOD OEMAKING sTOEAGEEA'rTEEraAES.

To all whom it may concern.' Be it known that I, HARRY L. BOYER, a. citizen of the United States, residin at Trenton,'in the county of Mercer and tate of New Jersey, have invented a certain new and useful Improvement in Methods of Making Storage-Battery Jars, of which the following is a full, clear, and exact description. f

This invention relates to certain improvements in the method of making hard rubber storage battery jars. VThe prlncipal Vobject of the invention is'to provide a method which is less expensive and simpler than the methods in use heretofore, andwhich produces a jar which is neat and attractive in a'p earance.

ubber storage batteries are made at the present time by wrapping soft uncured rub- -ber in sheet form about a core, and after the rubber has been' formed inthe shape of the jar on the core and pressed. against the same, the jar and core are 4placed 'in va vulcanizer to harden the rubber and cause the joints to be thoroughly knittedtogether after which the finished jar is stripped from It is customary in forming the soft-'unlcured jar on the core, to cover the outer surface of the rubber, particularly that: which forms the foursides of the ar, with tin in sheet form, the latter .serving to give the jar a polished appearance'and havingthe further function Aof preventing the rubber pulling away from the core by sticking to the pressure device which is used to press the rubber ontothe core.

By the present-invention I am enabled to avoid-entirely the necessity for the use of the sheettin, and at'the same time the v rubber does not cling to the pressure devvice and pull'away from-the core, and the j ar which is produced by the method has an external appearancel which'is'very attractin employed withvthe prior methods;

This .patterned or uneven surface which" lis givento theouter face' of the sheet con-A sists ofl closely varranged minor lprojectionsA wherein I have'shown several steps, of theprocess fof forming the jar and also the completed jar, Figure-1 illustrates the pre:

ferred way in which the rubber-is -given'a'n atented Sept. 7, 1920. i' Application mea Augustv 6, 1917.- seria1No..1s4,5eo;" s'

uneven or irregular surface on onegsidefin the accomplishment of the' objects'of'my inventionyFigQZ is a sideview of theun finished Jar formed by wrappingjabout the core, rubberformed and' treated as in' F ig.

l; Fig. Bshows inl-elevation :the lsoft jar on the core and reciprocating lplungers which constitute the preferred means'- of'pressing the rubber against'-the faces ofthe core;

Fig'. 4 is an enlarged detail view, show ing particularly the uneven outer surface `of the" sheet'rubber and the function of the minor'` depressions and. projections gduring the pressi-ng operation; Fig. -5 is a perspective View -of the finished jar; and -AFig.-6-is. an

'enlarged fragmentary view thereof showing `the pattern or col'iiig'l'irationv of,. the outer-f Y surface vof the jar.

jars, soft plastic-rubber in sheet .form is In forming hard rubber storagebattery I- wrapped aboutthe Sides'of a core 10 and a piece of the same materiallis 'placed overA the end of the jar,'after .which the edge portions o f the'- rubber are-'lapped and pressed :together A Herctofore these sheets `were smooth surfaced on both sides, and

oneA surfaceof the sheet which wrappedy about the sides of the jar was covered with a layer of thin. sheet-tin for thepurposes previously mentioned.

by running'thesheets' through a Vpair of rolls 11 and 12, one -ofwhich vhas a patterned surface which is transferred to one side of thesheetillustrated at 13. This'sheet when cut thev properdimensions is wrapped around the sides ofthe core inthe mannerl havingthis surface covered with the sheet shown at 14 in Fig. 2, .with the patternvor uneven surface on the outside, and without and depressions preferably'giving the sheet the appearance of 'roughlywoven cloth Aor 105-l l After the .rubber is wrapped around the a' regularfpattern effect-.

jar' and a piece'of rubber is lplaced' over the l end wit'h .the rubber overlapping where the ]oints occur, the rubber is pressed very i firmly against Athe core so that it will adhere to the latter at all points and so that the seams will be closed at allpoints. .This can be done; in differentways, but I prefer to accomplish it bythe use of smoothl faced plungers 15 which simultaneously press all points of the soft jar in against the four sidesigand end of the core in the manner illustratdin-Fig. 3, which shows three of the five plungers preferably employed. When these plungers are retracted, or when the pressure is relieved, the rubber is not pulled away from the core, but by reason of the minor closely 'arranged depressions and projections on the outer surface of the rubber, air is between the face of each plunger and the surface of the rubber, and there is absent the suction which heretofore would result inthe rubber pulling away from the coreI when the pressure is relieved. Thel manner` in which air may enter between the plunger and rubber is clearly illustrated in the enlarfred detail View of Fig. 4.-.

the core and the jar are placed in a vulcanizer and allowed to remain therein until the jar is thoroughly cured. VThen after removal from the vulcanizer the jar lis stripped from the core, this jar being shown at 16 in Fig. 5. This' jar is neat and attractive in appearance as the color -at the outer surface is very nearly 'uniform and the jar does not have the unsightly streakedyellowish-brown appearance that jars have after vulcanization if the outer surfaces are not covered with sheet tin.

I do not desire to be confined to the lpreoise details shown and described, but aim 1n my claims to cover all modifications fter the rubber hasbeen pressed'against the/core in the manner illustrated in Fig. 3,'

which do 'not involve a departureyfrom the v spirit and scope,of my invention. fi

Having thus described my invention, what I-claim is:- f

1. The method of making a hard rubber jar which comprises forming a strip ofunvulcanized rubber with'a roughened surface on one slde, placlng the same aboutl al corel with the roughened surface outward, pressing the rubber against the core, and vulcanizing the rubber on the'core.

2. The process ofmakingl` hard rubber jars which comprises forming a sheet of soft unvulcanlzed rubber .with minor pro- .jections and depressions on one side, wrapping the sheet about a-core with the u'neven surface outward, squeezing' the rubber 1 against the core vby externalpressure, and

vulcanizing the jar thus formed on the core. 3. The method of making a hard rubber jar which comprises running the rubber between a pair of rolls,` one4 having a smooth surface and the other a rough or irregular surface so that the sheet will have minor projections' and depressions on one side, wrapping the sheet about a core with the roughened surface on the outside, squeezing the rubber against the core, and vulcanizing surface of thev rubber and the pressing means, and vulcanizing the jar on the core. In testimony whereof I hereunto ailix my signature.

HARRY L. BOYER. 

